【Android】 Bitmap出现 decoder->decode returned false 错误

最新推荐文章于 2021-05-31 17:57:26 发布

转载最新推荐文章于 2021-05-31 17:57:26 发布 · 157 阅读

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Android Bitmap出现 decoder->decode returned false 错误

在开发Android中广告条，实现多张广告图片切换，遇到广告图片下载失败，抓取LOG

出现的问题为 decoder->decode returned false。

上网搜索发现解决办法，

参考文章 Android decoder->decode returned false for Bitmap download

文章地址 http://blog.163.com/dangzhengtao@yeah/blog/static/77800874201121814455655/

一种方法是

1.创建静态类FlushedInputStream

static class FlushedInputStream extends FilterInputStream {
        public FlushedInputStream(InputStream inputStream) {
            super(inputStream);
        }
 
        @Override
        public long skip(long n) throws IOException {
            long totalBytesSkipped = 0L;
            while (totalBytesSkipped < n) {
                long bytesSkipped = in.skip(n - totalBytesSkipped);
                if (bytesSkipped == 0L) {
                    int b = read();
                    if (b < 0) {
                        break;  // we reached EOF
                    } else {
                        bytesSkipped = 1; // we read one byte
                    }
                }
                totalBytesSkipped += bytesSkipped;
            }
            return totalBytesSkipped;
        }
    }

2. 修改图片下载代码

public void setDrawable() {
        URL url = null;
        URLConnection conn = null;
        try {
            url = new URL(“图片地址”);
            conn = url.openConnection();
            Bitmap b = BitmapFactory.decodeStream(new FlushedInputStream(conn.getInputStream()));
            this.drawable = new BitmapDrawable(b);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            url = null;
            conn = null;
        }
    }

另一种方法是

这里直接帖代码了，没有验证，有兴趣的朋友可以研究。

public static Bitmap loadImageFromUrl(String url) {
        URL m;
        InputStream i = null;
        BufferedInputStream bis = null;
        ByteArrayOutputStream out =null;
        try {
            m = new URL(url);
            i = (InputStream) m.getContent();
            bis = new BufferedInputStream(i,1024 * 8);
            out = new ByteArrayOutputStream();
            int len=0;
            byte[] buffer = new byte[1024];
            while((len = bis.read(buffer)) != -1){
                out.write(buffer, 0, len);
            }
            out.close();
            bis.close();
        } catch (MalformedURLException e1) {
            e1.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] data = out.toByteArray();
        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
        //Drawable d = Drawable.createFromStream(i, "src");
        return bitmap;
    }